to cancel a december 20th appearance at congressional hearings into the attack on the benghazi consulate and the announcement of senator john kerry's nomination to succeed her as secretary of state. >> he has a deep respect for the men and women of the state department. >> reporter: clinton's last public appearance was december 7th in belfast, northern ireland. she spoke then about her upcoming retirement and said she looked forward to having time to relax and think about things besides public life. in a statement release the last night, secretary clinton's spokesperson said her doctors will continue to assess her condition, including other issues associated with her concussion, and will determine if any further action is required. when asked whether secretary clinton is still able to work her spokesperson replied the secretary of state is the secretary of state. >> margaret brennan, thank you. medical correspondent dr. jon lapook is here. he is affiliated with new york presbyterian hospital where secretary clinton is being treated, but you are not involved in h